How long will | need labetolol?

I'm new here, and still trying to understand as much as I can about PE.

My daughter is now 5 weeks old and I'm still taking labetolol.I had been on 100mg twice a day - but after a GP check last week (118/75) she's reduced it to 50mg in morning & 100mg at night.If I forget to take the evening dose (easily done with a new baby & 2yr old) I get a blinding headache & have had a few random nose bleeds - so she's kept the evening dose at 100mg

I'd be interested to see how long anyone else needed labetolol/ BP meds for?When should I think about stopping it?